Earthworms usually have five hearts, but some species can have up to nine.
It's called a heart for simplicity, although it is actually an aortic arch. In between each arch is a gland that helps the worm digest calcium, which it gets from eating a lot of dirt.
More earthworm facts: There can more than one million earthworms in just one acre of land. Earthworms contain both female organs, as well as male organs, making them hermaphrodites. The largest earthworm ever recorded was found in South Africa; from its nose to its tail it measured 22 feet long.
(source: Earthworm Facts)
More earthworm facts: There can more than one million earthworms in just one acre of land. Earthworms contain both female organs, as well as male organs, making them hermaphrodites. The largest earthworm ever recorded was found in South Africa; from its nose to its tail it measured 22 feet long.
(source: Earthworm Facts)
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